Mafi isn’t a high-profile recruit — he’s rated a two-star by Rivals.com and Scout.com — but he certainly adds heft to the Bears’ defense, saying he currently measures 6-4, 380 pounds.

New Cal coach Justin Wilcox, who appears to be placing a priority on defense with his first recruiting class, now has commitments from four defensive linemen, all from Northern California. Five of Cal’s seven commits play defense, and none of the newcomers measures under 6-1 or 200 pounds.

Other defensive line commits include ends J.H. Tevis from Menlo and Nick Alftin from Archbishop Mitty, and tackle Justin Kakala from Manteca. The Bears also have a commitment from outside linebacker Omari Harris from Antioch. He is the highest-rated Cal recruit, with a four-star ranking from Scout.

Mafi said he had offers from San Jose State, Hawaii and Air Force, but he made a commitment to the Bears after attending a linemen’s camp in Berkeley last weekend.

“It was my first Pac-12 offer,” Mafi said.

Mafi is expected to play nose tackle in the new 3-4 defense being installed by the Cal defensive staff. He will be a two-way player this fall at Serra, which runs a 4-3 defense.